Verifying that a named and existing file is a normal file, to avoid

opening an empty buffer when the name of a directory is specified. 


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5304 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2015-07-17  Benno Schulenberg  <bensberg@justemail.net>
+	* src/files.c (open_buffer): Verify that a named and existing file
+	is a normal file, to avoid opening an empty buffer when the name of
+	a directory is specified.  This fixes Savannah bug #45383 reported
+	by Mike Frysinger, and also Savannah bug #27839 (which is an echo
+	from Debian bug #551717 reported by Paul Wise).
+
 2015-07-17  Mike Frysinger  <vapier@gentoo.org>
 	* src/browser.c (browser_refresh): Use the proper type (off_t) for
 	the size of a file, and avoid warnings about too large bit shifts.

src/files.c

@@ -339,6 +339,21 @@ void open_buffer(const char *filename, bool undoable)
     }
 #endif
 
+    /* When the specified filename is not empty, and the thing exists,
+     * verify that it is a normal file. */
+    if (strcmp(filename, "") != 0) {
+	struct stat fileinfo;
+
+	if (stat(filename, &fileinfo) == 0 && !S_ISREG(fileinfo.st_mode)) {
+	    if (S_ISDIR(fileinfo.st_mode))
+		statusbar(_("\"%s\" is a directory"), filename);
+	    else
+		statusbar(_("\"%s\" is not a normal file"), filename);
+	    beep();
+	    return;
+	}
+    }
+
     /* If we're going to load into a new buffer, first create the new
      * buffer and lock the corresponding file. */
     if (new_buffer) {